Year	%
1998	99.47036
1999	100
2000	99.84363
2001	99.90946
2002	100
2003	100
2004	99.80689
2005	100
2006	99.25906
2007	99.89265
2008	99.52315
2009	100
2010	100
2011	100
2012	98.46391
2013	100
2014	99.86252
2015	100
2016	99.33463